A Hat Full of Sky (Discworld #32)

The Heroine: Tiffany Aching, incipient witch and cheese maker extraordinaire. Once saved world from Queen of the Elves. Is about to discover that battling evil monarchs is child's play compared to mortal combat with a Hiver (see below).

Long Synopsis:

The Heroine: Tiffany Aching, incipient witch and cheese maker extraordinaire. Once saved world from Queen of the Elves. Is about to discover that battling evil monarchs is child's play compared to mortal combat with a Hiver (see below). At eleven years old, is boldest heroine ever to have confronted the Forces of Darkness while armed with a frying pan.
The Threat: A Hiver, insidious disembodied presence drawn to powerful magic. highly dangerous, frequently lethal. Cannot be stopped with iron or fire. Its target: Tiffany Aching (see above).
The Nac Mac Feegle: A.k.a. the Wee Free Men. Height: six inches. Color: blue. Famed for drinking, stealing, and fighting. Will attack anything larger than themselves. Members include: Rob Anybody, Daft Wullie, and Awfully Wee Billy Bigchin. Allies to Tiffany Aching (see above).
The Book: Hilarious, breathtaking, spine-tingling sequel to the acclaimed Wee Free Men.
The Author: Terry Pratchett, celebrated creator of the internationally best-selling Discworld series. Carnegie Medalist and writer extraordinaire.